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Series-Parallel Circuits

Study 29 Electrical Engineering MCQs with correct answers and explanations.

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21Electrical EngineeringMedium

A certain voltage divider consists of two 12 kΩ resistors in series. Which of the following load resistors will have the most effect on the output voltage?

A1 MΩ

B18 kΩ

C12 kΩ

D24 kΩ

Correct answer

C. 12 kΩ

Explanation

The correct answer is 12 kΩ.

22Electrical EngineeringMedium

A voltage divider consists of two 68 kΩ resistors and a 24 V source. The unknown output voltage is________?

A0 V

B24 V

C12 V

D6 V

Correct answer

C. 12 V

Explanation

The correct answer is 12 V.

23Electrical EngineeringMedium

A voltage divider consists of two 100 kΩ resistors and a 12 V source. What will the output voltage be if a load resistor of 1 MΩ is connected to the output?

A6 V

B12 V

C0.57 V

D5.7 V

Correct answer

D. 5.7 V

Explanation

The correct answer is 5.7 V.

24Electrical EngineeringMedium

The first goal to accomplish in analyzing a complex series-parallel circuit is to________?

Asolve for all the voltage drops

Bequate all series components

Cequate all parallel components

Dsolve for the total current and resistance

Correct answer

D. solve for the total current and resistance

Explanation

The correct answer is solve for the total current and resistance.

25Electrical EngineeringMedium

Two 1.2 kΩ resistors are in series and this series combination is in parallel with a 3.3 kΩ resistor. The total resistance is________?

A1,389 Ω

B5,700 Ω

C880 Ω

D138 Ω

Correct answer

A. 1,389 Ω

Explanation

The correct answer is 1,389 Ω.

26Electrical EngineeringMedium

A 6 V battery output is divided down to obtain two output voltages. Three 2.2 kΩ resistors are used to provide the two taps. The two output voltages are________?

A4 V, 6 V

B2 V, 6 V

C2 V, 4 V

D2 V, 2 V

Correct answer

C. 2 V, 4 V

Explanation

The correct answer is 2 V, 4 V.

27Electrical EngineeringMedium

A 12 kΩ resistor, a 15 kΩ resistor, and a 22 kΩ resistor are in series with two 10 kΩ resistors that are in parallel. The source voltage is 75 V. Current through the 15 kΩ resistor is approximately________?

A1.4 mA

B14 mA

C50 mA

D5 mA

Correct answer

A. 1.4 mA

Explanation

The correct answer is 1.4 mA.

28Electrical EngineeringMedium

If R1 is in series with parallel connected to R2 and R3, what happens to total current if R2 opens?

Adecreases

Bincreases

Cremains the same

Dcannot tell

Correct answer

A. decreases

Explanation

The correct answer is decreases.

29Electrical EngineeringMedium

Three 10 kΩ resistors are connected in series. A 20 kΩ resistor is connected in parallel across one of the 10 kΩ resistors. The voltage source is 24 V. The total current in the circuit is________?

A90 mA

B800 μA

C9 mA

D900 μA

Correct answer

D. 900 μA

Explanation

The correct answer is 900 μA.

21Electrical EngineeringMedium

A certain voltage divider consists of two 12 kΩ resistors in series. Which of the following load resistors will have the most effect on the output voltage?

A1 MΩ

B18 kΩ

C12 kΩ

D24 kΩ

Correct answer

C. 12 kΩ

Explanation

The correct answer is 12 kΩ.

22Electrical EngineeringMedium

A voltage divider consists of two 68 kΩ resistors and a 24 V source. The unknown output voltage is________?

A0 V

B24 V

C12 V

D6 V

Correct answer

C. 12 V

Explanation

The correct answer is 12 V.

23Electrical EngineeringMedium

A voltage divider consists of two 100 kΩ resistors and a 12 V source. What will the output voltage be if a load resistor of 1 MΩ is connected to the output?

A6 V

B12 V

C0.57 V

D5.7 V

Correct answer

D. 5.7 V

Explanation

The correct answer is 5.7 V.

24Electrical EngineeringMedium

The first goal to accomplish in analyzing a complex series-parallel circuit is to________?

Asolve for all the voltage drops

Bequate all series components

Cequate all parallel components

Dsolve for the total current and resistance

Correct answer

D. solve for the total current and resistance

Explanation

The correct answer is solve for the total current and resistance.

25Electrical EngineeringMedium

Two 1.2 kΩ resistors are in series and this series combination is in parallel with a 3.3 kΩ resistor. The total resistance is________?

A1,389 Ω

B5,700 Ω

C880 Ω

D138 Ω

Correct answer

A. 1,389 Ω

Explanation

The correct answer is 1,389 Ω.

26Electrical EngineeringMedium

A 6 V battery output is divided down to obtain two output voltages. Three 2.2 kΩ resistors are used to provide the two taps. The two output voltages are________?

A4 V, 6 V

B2 V, 6 V

C2 V, 4 V

D2 V, 2 V

Correct answer

C. 2 V, 4 V

Explanation

The correct answer is 2 V, 4 V.

27Electrical EngineeringMedium

A 12 kΩ resistor, a 15 kΩ resistor, and a 22 kΩ resistor are in series with two 10 kΩ resistors that are in parallel. The source voltage is 75 V. Current through the 15 kΩ resistor is approximately________?

A1.4 mA

B14 mA

C50 mA

D5 mA

Correct answer

A. 1.4 mA

Explanation

The correct answer is 1.4 mA.

28Electrical EngineeringMedium

If R1 is in series with parallel connected to R2 and R3, what happens to total current if R2 opens?

Adecreases

Bincreases

Cremains the same

Dcannot tell

Correct answer

A. decreases

Explanation

The correct answer is decreases.

29Electrical EngineeringMedium

Three 10 kΩ resistors are connected in series. A 20 kΩ resistor is connected in parallel across one of the 10 kΩ resistors. The voltage source is 24 V. The total current in the circuit is________?

A90 mA

B800 μA

C9 mA

D900 μA

Correct answer

D. 900 μA

Explanation

The correct answer is 900 μA.